1, the module with level signal output, with alarm signal indicators; 2, the sensor module with analog signal output voltage range :0-5V; 3, active low level signal outputs can be driven PNP transistors can also be connected microcontroller IO port; 4, the analog output voltage increases with the concentration, the higher the concentration the higher the voltage; 5, to ammonia, trimethylamine, ethanolamine gas with high sensitivity; 6, with a long service life and reliable stability; 7, after preheating with fast response and recovery characteristics; 8, with mounting holes to facilitate fixed installation; 9, the probe can plug design, easy to test; 10, the module with temperature compensation function, adaptability and more reliable.